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Structures and ion transport mechanisms of plant high-affinity potassium transporters

Molecular Plant 2024年第3期17卷 409-422页

作者： Jiangqin Wang Yanping Luo Fan Ye Zhong Jie Ding Shao Jian Zheng Shuai Qiao Yong Wang Jiangtao Guo Wei Yang Nannan Su international Institutes of Medicine the Fourth Affiliated HospitalZhejang University School of MedicineYiwuZhejiang 322000China Department of Biophysics and Department of Neurology of the Fourth Affiliated Hospital Zhejiang University School of MedicineHangzhouZhejang 310058China State Key Laboratory of Plant Environmental Resilience College of Life SciencesZhejang UniversityHangzhouZhejang 310058China College of Life Sciences Zhejiang UniversityHangzhouZhejiang 310058China NHC and CAMS Key Laboratory of Medical Neurobiology MOE Frontier Science Center for Brain Science and Brain-machine IntegrationSchool of Brain Science and Brain MedicineZhejiang UniversityHangzhouZhejiang 310058China Nanhu Brain-computer Interface Institute Hangzhou.Zheiang 311100.China

Plant high-affinity K^(+) transporters(HKTs)mediate Na^(+) and K^(+) uptake,maintain Na^(+)/K^(+) homeostasis,and therefore play crucial roles in plant salt tolerance.In this study,we present cryoelectron microscopy structures of HKTs from two classes,classI HKT1;1 from Arabidopsis thaliana(AtHKT1;1)and class II HKT2;1 from Triticum aestivum(TaHKT2;1),in both Na^(+) -and K^(+) -bound states at 2.6-to 3.0-A resolutions.BothAtHKT1;1and TaHKT2;1function ashomodimers.Each HKT subunit consists of four tan-dem domain units(D1-D4)with a repeated K^(+) -channel-like M-P-M topology.In each subunit,D1-D4 assemble into an ion conduction pore with a pseudo-four-fold symmetry.Although both TaHKT2;1and AtHKT1;1 have only one putative Na^(+) ion bound in the selectivity filter with a similar coordination pattern,the two HKTs display different K^(+) binding modes in the filter.TaHKT2;1 has three K^(+) ions bound in the selec-tivity filter,but AtHKT1;1 has only two K^(+) ions bound in the filter,which has a narrowed external entrance due to the presence of a Ser residue in the first filter motif.These structures,along with compu-tational,mutational,and electrophysiological analyses,enable us to pinpoint key residues that are critical for the ion selectivity of HKTs.The findings provide new insights into the ion selectivity and ion transport mechanisms of plant HKTs and improve our understanding about how HKTs mediate plant salt tolerance and enhance crop growth.

关键词： HKTs structure ion selectivity mechanism salt tolerance

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Composite laminar membranes for electricity generation from water evaporation

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Nano Research 2024年第1期17卷 307-311页

作者： Xiao Wang Gang Yuan Han Zhou Yu Jiang Shuo Wang Jiaojiao Ma Chongyang Yang Sheng Hu State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China

Harvesting clean energy from water evaporation has been extensively investigated due to its sustainability.To achieve high efficiency,energy conversion materials should contain multiple features which are difficult to be simultaneously obtained from single-component materials.Here we use composite laminar membranes assembled by nanosheets of graphene oxide and mica,and find a sustained power density induced by water evaporation that is two orders of magnitude larger than that from membranes made by either of the components.The power output is attributed to selective proton transport driven by water evaporation through the interlayer nanochannels in the membranes.This process relies on the synergistic effects from negatively charged and hydrophilic mica surfaces that are important for proton selectivity and water transport,and the tunable electrical conductivity of graphene oxide that provides optimized internal resistance.The demonstrated composite membranes offer a strategy of enhancing power generation by combining the advantages from each of their components.

关键词： graphene oxide mica water evaporation electrical double layer surface charge ion selectivity

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Electrochemical characterization of ion selectivity in electrodeposited nickel hexacyanoferrate thin films

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Journal of University of Science and Technology Beijing 2008年第1期15卷 79-83页

作者： Jinxia Guo Xiaogang Hao Xuli Ma Zhonglin Zhang Shibin Liu Department of Chemical Engineering Talyuan University of Technology Talyuan 030024 China

The ion selectivity of electrodeposited nickel hexacyanoferrate （NiHCF） thin films was investigated using electrochemical impedance spectroscopy （EIS） and cyclic voltammetry （CV）. NiHCF thin films were prepared by cathodic deposition on Pt and Al substrates. EIS and CV curves were determined in 1 mol/L （KNO3＋C5NO3） and 1 mol/L （NaNO3＋CsNO3） mixture solutions, which were sensitive to the concentration of Cs^＋ in the electrolytes. Experimental results show that all Nyquist impedance plots show depressed semicircles in the high-frequency range changing over into straight lines at lower frequencies. With increasing amounts of Cs^＋, the redox potentials in CV curves shift toward more positive values and the redox peaks broaden; the semicircle radius in corresponding EIS curves and the charge transfer resistance also increase. EIS combining CV is able to provide valuable insights into the ion selectivity of NiHCF thin films. 2008 University of Science and Technology Beijing. All rights reserved.

关键词： NiHCF thin films ion selectivity electrochemical deposition cyclic voltammetry electrochemical impedance spectra

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Synthetic Channel-forming Peptides and ion selectivity

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Chemical Research in Chinese Universities 2006年第2期22卷 265-266页

作者： Roger W. Roeske Department of Biochemistry and Molecular Biology School of Medicine Indiana University Indianapolis IN 46-202 USA

Introduction Peptides made up of alternating L- and D- amino acids can form β-helices as in gramicidin A or cyclic peptides that aggregate to form tubes In both cases the structures are hollow with all the side chains projecting outwards. Kennedy et al. postulated that. peptides having the （LLLD）n configuration could form helices with every fourth side chain projecting inward. It is a fact that synthetic N-formyl- （LeuSerLeuGly） 6- OH, when added to a lipid bilayer, dimerizes, to form ion channels having conductances greater than that of gramicidin.

关键词： Cyclic peptide ion channels ion selectivity

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Reconstructing proton channels via Zr-MOFs realizes highly ion-selective and proton-conductive SPEEK-based hybrid membrane for vanadium flow battery

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Journal of Energy Chemistry 2022年第12期75卷 448-456,I0012页

作者： Denghua Zhang Wenjie Yu Yue Zhang Sihan Cheng Mingyu Zhu Shuai Zeng Xihao Zhang Yifan Zhang Chao Luan Zishen Yu Lansong Liu Kaiyue Zhang Jianguo Liu Chuanwei Yan Institute of Metal Research Chinese Academy of SciencesShenyang 110016LiaoningChina School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016LiaoningChina

There is an urgent need to break through the trade-off between proton conductivity and ion selectivity of proton exchange membrane(PEM)in vanadium flow battery(VFB).Proton channels in PEM are the key to controlling the ion sieving and proton conductivity in VFB.Herein,two types of proton channels are reconstructed in the hybrid membrane via introducing modified Zr-MOFs(IM-UIO-66-AS)into SPEEK matrix.Internal proton channels in IM-UIO-66-AS and interfacial proton channels between grafted imidazole groups on Zr-MOFs and SPEEK greatly improve the conductivity of the IM-UIO-66-AS/SPEEK hybrid membrane.More importantly,both reconstructed proton channels block the vanadium-ion permeation to realize enhanced ion selectivity according to the size sieving and Donnan exclusion effects,respectively.Moreover,the hybrid membrane exhibits good mechanical property and dimensional stability.Benefiting from such rational design,a VFB loading with the optimized membrane exhibits enhanced voltage efficiency of 79.9%and outstanding energy efficiency of 79.6%at 200 m A cm^(-2),and keeps a notable cycle stability for 300 cycles in the long-term cycling test.Therefore,this study provides inspiration for preparing next-generation PEMs with high ion selectivity and proton conductivity for VFB application.

关键词： Vanadium flow battery Hybrid membrane Metal organic framework Proton channel ion selectivity

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Biomimetic high-flux proton pump constructed with asymmetric polymeric carbon nitride membrane

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Nano Research 2023年第1期16卷 18-24页

作者： Yizhu Zhang Shangfa Pan Yuanyuan Zhang Shaoqiang Su Xia Zhang Jian Liu Jun Gao College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101China Shandong Energy Institute Qingdao 266101China Physics of complex fluids University of TwenteEnschede 7522 NBthe Netherlands

Biological proton pumps ferry protons in an active manner and have a high flux(a few to 10 protons/(s·nm^(2))).Integrating these features in an artificial membrane may open the way for a wide range of applications but it remains challenging.In this work,we employed a structural engineering strategy to construct an asymmetric photonic polymeric carbon nitride(C3N4)membrane that exhibited photo-driven high flux proton pumping performance.The ion transport path through the membrane is reminiscent of that in the high-flux asymmetric biological ion channel.In addition,it has a photonic structure that mimics the mosquito compound eyes with improved light adsorption.Finally,the asymmetric structure constitutes an isotype(n-n)heterojunction that enhances the separation of the light-induced electron-hole pairs.As a result,the membrane shows a flux of 89μA/cm^(2)under 100 mW/cm^(2)white light illumination(approximately one sun),the highest ever reported.This translates to a pumping rate of~6 proton/(s·nm^(2)),comparable to the biological counterpart.This work highlights the potential of multi-level structural engineering to construct high-performance bionic devices,and may find applications in solar energy harvesting and solar powered membrane process.

关键词： polymeric carbon nitride membrane ion selectivity proton pump light harvesting

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A fiber-reinforced solid polymer electrolyte by in situ polymerization for stable lithium metal batteries

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Nano Research 2023年第7期16卷 9259-9266页

作者： Yifan Xu Ruo Zhao Lei Gao Tingsong Gao Wenjuan Wang Juncao Bian Songbai Han Jinlong Zhu Qiang Xu Yusheng Zhao Institute for Advanced Study Shenzhen UniversityShenzhen 518055China Guangdong Provincial Key Laboratory of Energy Materials for Electric Power Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and DevicesAcademy for Advanced Interdisciplinary StudiesSouthern University of Science and TechnologyShenzhen 518055China Shenzhen Key Laboratory of Micro/Nano-Porous Functional Materials Department of Materials Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China School of Materials Science and Engineering Peking UniversityBeijing 100871China

Solid polymer electrolytes(SPEs)by in situ polymerization are attractive due to their good interfacial contact with electrodes.Previously reported in situ polymerized SPEs,however,suffer from the low polymerization degree that causes poor mechanical strength,Li dendrite penetration,and performance decay in Li-metal batteries.Although highly polymerized SPEs are more stable than lowly polymerized ones,they are restricted by their sluggish long-chain mobility and poor ionic conductivity.In this work,a three-dimensional fibrous membrane with ion selectivity was prepared and used as a functional filler for the in situ formed SPE.The obtained SPE has high stability due to its high polymerization degree after the long-term heating process.The fibrous membrane plays a vital role in improving the SPE’s properties.The rich anion-adsorption sites on the fibrous membrane can alleviate the polarization effect and benefit a uniform current distribution at the interface.The fibrous nanostructure can efficiently interact with the polymeric matrix,providing rich hopping sites for fast Li+migration.Consequently,the obtained SPE enables a uniform Li deposition and long-term cycling performance in Li-metal batteries.This work reported an in situ formed SPE with both high polymerization degree and ionic conductivity,paving the way for designing high-performance SPEs with good comprehensive properties.

关键词： solid polymer electrolytes fibrous solid filler metal-organic frameworks in situ polymerization ion selectivity

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ion and water transport in charge-modified graphene nanopores

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Chinese Physics B 2015年第10期24卷 553-558页

作者：裘英华李堃陈伟宇司伟谭启檐陈云飞 School of Mechanical Engineering and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments Southeast University

Porous graphene has a high mechanical strength and an atomic-layer thickness that makes it a promising material for material separation and biomolecule sensing. Electrostatic interactions between charges in aqueous solutions are a type of strong long-range interaction that may greatly influence fluid transport through nanopores. In this study, molecular dynamic simulations were conducted to investigate ion and water transport through 1.05-nm diameter monolayer graphene nanopores, with their edges charge-modified. Our results indicated that these nanopores are selective to counterions when they are charged. As the charge amount increases, the total ionic currents show an increase-decrease profile while the coion currents monotonically decrease. The co-ion rejection can reach 76.5% and 90.2% when the nanopores are negatively and positively charged, respectively. The Cl-ion current increases and reaches a plateau, and the Na＋current decreases as the charge amount increases in systems in which Na＋ions act as counterions. In addition, charge modification can enhance water transport through nanopores. This is mainly due to the ion selectivity of the nanopores. Notably, positive charges on the pore edges facilitate water transport much more strongly than negative charges.

关键词： monolayer porous graphene charge-modified nanopore ion selectivity ionic current water trans-port

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An overview of amphoteric ion exchange membranes for vanadium redox flow batteries

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Journal of Materials Science & Technology 2021年第10期69卷 212-227页

作者： Lei Liu Chao Wang Zhenfeng He Rajib Das Binbin Dong Xiaofeng Xie Zhanhu Guo College of Materials Science and Engineering North University of ChinaTaiyuan 030051China School of Chemical Engineering and Technology North University of ChinaTaiyuan 030051China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450052China Integrated Composites Laboratory(ICL) Department of Chemical Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA Oxea Chemical Company(OQJ Bay CityTX 77414USA

Vanadium redox flow battery(VRB),as the most promising large-scale electrical energy storage units,has attracted extensive attention.Amphoteric ion exchange membrane(AIEM),as the core part of VRB,separates electrolyte on both sides of electrolytic tank and conducts H+.The AIEM with cation and anion groups possesses excellent performances,such as high ion conductivity(σ),low vanadium ion permeability(Pvn+),relative stability and low cost.However,the performance of AIEM directly depends on the chemical structure of polymers.In addition to ensuring foundational physical performance,ion selectivity of AIEM is significant since the crossover of vanadium ion with various valences may reduce the battery capacity.In this paper,AIEMs for VRB and their chemical structures as well as synthesis approaches to realize all kinds of high-performing AIEMs are reviewed.The current trend and future direction of prospective materials for the VRB separators are documented in detail as well.

关键词： AIEMs VRB Proton conduction ion selectivity

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Single-layer graphene as a highly selective barrier for vanadium crossover with high proton selectivity

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Journal of Energy Chemistry 2021年第8期30卷 419-430,I0009页

作者： Saheed Bukola Zhaodong Li Jason Zack Christopher Antunes Carol Korzeniewski Glenn Teeter Jeffrey Blackburn Bryan Pivovar National Renewable Energy Laboratory(NREL) 80401 GoldenUnited States Department of Chemistry Texas Tech University79409 LubbockUnited States*Corresponding author(email:Saheed.Bukola@nrel.gov

We report near-zero crossover for vanadium cross-permeation through single-layer graphene immobilized at the interface of two Nafion?polymer electrolyte membranes.Vanadium ion diffusion and migration,including proton mobility through membrane composites,were studied with and without graphene under diffusion and migration conditions.Single-layer graphene was found to effectively inhibit vanadium ion diffusion and migration under specific conditions.The single-layer graphene composites also enabled remarkable ion transmission selectivity improvements over pure Nafion membranes,with proton transport being four orders of magnitude faster than vanadium ion transport.Resistivity values of 0.02±0.005Ωcm^(2) for proton and 223±4Ωcm^(2) for vanadium ion through single atomic layer graphene are reported.This high selectivity may have significant impact on flow battery applications or for other electrochemical devices where proton conductivity is required,and transport of other species is detrimental.Our results emphasize that crossover may be essentially completely eliminated in some cases,enabling for greatly improved operational viability.

关键词： ion selectivity Polymer electrolyte membrane Redox flow battery Single-layer graphene Vanadium crossover 2D nanomaterial

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